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