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