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