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