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