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