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