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