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