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