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