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