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