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