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