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