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