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