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