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