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