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