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