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