One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,8)(5,6)(9,10)(11,15)(12,14)(13,16)(17,18)(19,24)(20,30)(21,25)(22,26)(23,27)(28,38)(29,39)(31,47)(32,44)(33,40)(34,41)(35,42)(36,43)(37,45)(46,48) involution — undirected(2,6)(7,8)(9,11)(10,13)(12,16)(14,15)(17,19,22,20)(18,24,26,30)(21,33,34,46)(23,32,36,29)(25,40,41,48)(27,44,43,39)(28,37,31,35)(38,45,47,42)(1,3,5,4)(2,7,6,8)(10,14)(11,16)(17,20,22,19)(18,24,26,30)(21,31,34,28)(23,32,36,29)(25,38,41,47)(27,39,43,44)(33,35,46,37)(40,45,48,42)(10,14)(13,15)(17,21,22,34)(18,25,26,41)(19,28,20,31)(23,37,36,35)(24,38,30,47)(27,45,43,42)(29,46,32,33)(39,48,44,40)(1,4,5,3)(2,7,6,8)(10,14)(13,15)(19,20)(24,30)(28,31)(29,32)(33,46)(38,47)(39,44)(40,48)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.