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