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