One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,8)(3,6,4,7)(9,10)(11,12)(13,14)(15,16)(17,18)(19,23)(20,26)(21,25)(22,24)(27,30)(28,32)(29,31)(1,2)(3,6)(4,7)(5,8)(17,19)(18,23)(20,24)(21,27)(22,26)(25,30)(28,31)(29,32) involution — undirected(1,3,5,4)(2,6,8,7)(10,14)(11,15)(18,24)(19,26)(21,29)(28,30)(1,3,5,4)(2,6,8,7)(9,11,13,15)(10,12,14,16)(17,18)(19,20)(21,25)(22,24)(23,26)(27,28)(29,31)(30,32)(1,3,5,4)(2,6,8,7)(9,12)(10,15)(11,14)(13,16)(17,20)(18,19)(21,28)(22,23)(24,26)(25,27)(29,30)(31,32)(1,4,5,3)(2,7,8,6)(17,21)(18,25)(19,27)(20,28)(22,29)(23,30)(24,31)(26,32)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.