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