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