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