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