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