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)(11,14,15,16)(17,18,21,23)(19,27,29,32)(20,26,22,25)(24,30,31,28)(1,2)(3,6)(4,8)(5,7)(10,13)(11,15)(18,23)(24,31)(25,26)(27,32) involution — undirected(1,3,5,4)(2,6,7,8)(9,11,12,15)(10,14,13,16)(17,19)(18,24)(20,28)(21,29)(22,30)(23,31)(25,27)(26,32)(2,7)(6,8)(10,13)(14,16)(17,20,21,22)(18,25,23,26)(19,28,29,30)(24,27,31,32)(1,4,5,3)(2,8,7,6)(17,20,21,22)(18,25,23,26)(19,28,29,30)(24,27,31,32)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.