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)(15,20)(16,17)(18,19)(22,25)(23,29)(24,32)(34,36) involution — undirected(6,7)(10,11)(14,19)(15,16)(21,22,26,25)(23,30,29,27)(24,28,32,33)(31,36,35,34)(8,12)(10,11)(13,15,18,16)(14,20,19,17)(21,23,26,29)(22,27,25,30)(24,31,32,35)(28,34,33,36)(1,2)(3,4)(5,7,9,6)(8,10,12,11)(13,16,18,15)(14,17,19,20)(21,24)(22,28)(23,31)(25,33)(26,32)(27,34)(29,35)(30,36)(5,8,9,12)(6,10,7,11)(13,17)(14,16)(15,19)(18,20)(21,25,26,22)(23,27,29,30)(24,28,32,33)(31,36,35,34)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.