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