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