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