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