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