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