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