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