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)(15,20)(16,19)(17,25)(18,22)(21,26)(23,27)(24,28) involution — undirected(1,2)(3,4)(13,15,18,16)(14,19,22,20)(17,23,26,24)(21,27,25,28)(6,9)(10,11)(13,14,18,22)(15,20,16,19)(17,21,26,25)(23,28,24,27)(5,6)(7,10)(8,9)(11,12)(13,14)(15,19)(16,20)(17,21)(18,22)(23,27)(24,28)(25,26) involution — undirected(5,7)(6,10)(8,12)(9,11)(13,16,18,15)(14,20,22,19)(17,24,26,23)(21,28,25,27)(13,17)(14,21)(15,23)(16,24)(18,26)(19,27)(20,28)(22,25) 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.