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