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)(11,13)(12,14)(15,16)(17,18)(19,23)(20,27)(21,29)(22,25)(24,26)(28,31)(30,32)(1,3)(2,6)(4,7)(5,8)(9,10)(11,15)(12,14)(13,16)(17,19,22,21)(18,23,25,29)(20,26,28,30)(24,31,32,27)(1,4,5,2)(3,7,8,6)(9,11)(10,13)(12,16)(14,15)(17,20)(18,24)(19,26)(21,30)(22,28)(23,31)(25,32)(27,29)(3,8)(6,7)(11,16)(13,15) involution — undirected(10,14)(13,15)(17,19,22,21)(18,23,25,29)(20,26,28,30)(24,31,32,27)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.