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