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