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