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