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