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