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