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