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