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