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