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