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