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