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