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