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