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)(19,26)(20,25)(21,27)(22,37)(23,29)(24,28)(30,42)(31,40)(32,39)(33,41)(34,48)(35,46)(36,45)(38,44)(43,47)(1,3,4,8)(2,5,6,7)(9,11)(10,13)(12,15)(14,16)(17,19)(18,25)(20,23)(21,34)(22,31)(24,33)(26,29)(27,43)(28,40)(30,35)(32,38)(36,47)(37,41)(39,46)(42,44)(45,48)(10,14)(11,15)(17,20,23,19)(18,26,29,25)(21,32,36,30)(22,31,24,33)(27,42,45,39)(28,40,37,41)(34,35,47,38)(43,46,48,44)(10,14)(13,16)(17,21)(18,27)(19,30)(20,32)(22,35)(23,36)(24,38)(25,39)(26,42)(28,44)(29,45)(31,47)(33,34)(37,46)(40,43)(41,48) involution — undirected(2,6)(5,7)(17,22,23,24)(18,28,29,37)(19,31,20,33)(21,35,36,38)(25,40,26,41)(27,44,45,46)(30,47,32,34)(39,43,42,48)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.