One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,4)(3,7,8,6)(9,10)(11,14)(12,13)(15,16)(17,18)(19,28)(20,23)(21,25)(22,26)(24,30)(27,32)(29,31)(1,3)(2,6)(4,7)(5,8)(17,18)(19,29)(20,24)(21,25)(22,27)(23,30)(26,32)(28,31) involution — undirected(1,4,5,2)(3,7,8,6)(10,13)(14,16)(17,19,21,20)(18,23,25,28)(22,31,32,30)(24,27,29,26)(3,8)(6,7)(9,11,12,15)(10,14,13,16)(17,20,21,19)(18,24,25,29)(22,31,32,30)(23,27,28,26)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.