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