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