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