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