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