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