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