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