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