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