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)(17,18,22,27,23,29,39,28)(19,30,32,42,34,45,33,24)(20,35,36,25,37,43,21,26)(31,44,38,48,47,40,46,41)(3,9)(4,12)(6,13)(7,11)(17,19)(18,24)(20,31)(21,38)(22,33)(23,34)(25,40)(26,44)(27,45)(28,30)(29,42)(32,39)(35,41)(36,46)(37,47)(43,48) involution — undirected(1,3,5,9)(2,6,8,13)(4,10,12,15)(7,14,11,16)(17,20,22,36,23,37,39,21)(18,25,28,35,29,26,27,43)(19,31,33,46,34,47,32,38)(24,40,30,41,42,44,45,48)(3,9)(6,13)(10,15)(14,16)(17,21,39,37,23,36,22,20)(18,26,28,43,29,25,27,35)(19,31,33,46,34,47,32,38)(24,41,45,40,42,48,30,44)(1,4,5,12)(2,7,8,11)(3,10,9,15)(6,14,13,16)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.