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