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