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