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