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