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