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