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