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