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