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