One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(6,10)(8,11)(12,16)(13,17)(15,18)(19,20)(21,22)(23,31)(24,27)(25,35)(26,30)(28,33)(29,32)(34,36) involution — undirected(5,6,11,17,9,13,8,10)(7,12,18,20,14,19,15,16)(21,23,32,34,26,33,25,24)(22,27,35,28,30,36,29,31)(5,7,9,14)(6,12,13,19)(8,15,11,18)(10,16,17,20)(21,24,25,33,26,34,32,23)(22,28,29,27,30,31,35,36)(1,2,3,4)(7,14)(12,19)(15,18)(16,20)(23,33)(24,34)(27,36)(28,31)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.