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