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