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