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