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