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