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