One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,8)(4,9)(5,13)(6,7)(10,15)(11,12)(14,16)(17,18)(19,22)(20,24)(21,25)(23,26)(27,30)(28,29)(31,32)(33,34,39,37)(35,42,36,40)(38,41,46,45)(43,48,44,47)(2,7)(4,8)(10,13)(12,14)(17,19)(18,22)(20,27)(21,26)(23,25)(24,30)(28,31)(29,32)(33,35,39,36)(34,40,37,42)(38,43,46,44)(41,47,45,48)(2,7)(3,9)(10,13)(11,16)(19,26)(22,23)(27,32)(30,31)(33,34,39,37)(35,40,36,42)(38,41,46,45)(43,47,44,48)(1,3)(2,8)(4,7)(5,11)(6,9)(10,14)(12,13)(15,16)(17,19)(18,23)(20,27)(21,26)(22,25)(24,31)(28,30)(29,32)(33,36,39,35)(34,40,37,42)(38,44,46,43)(41,47,45,48)(1,4,6,8)(2,9,7,3)(5,14,15,12)(10,11,13,16)(17,18)(19,22)(20,28)(21,25)(23,26)(24,29)(27,31)(30,32)(33,37,39,34)(35,42,36,40)(38,41,46,45)(43,47,44,48)(1,5,6,15)(2,10,7,13)(3,11,9,16)(4,12,8,14)(17,20)(18,24)(19,27)(21,29)(22,30)(23,31)(25,28)(26,32)(33,38,39,46)(34,41,37,45)(35,43,36,44)(40,47,42,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.