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